Nontechnical name for a negative pressure ventilator (4,4)

I believe the answer is:

iron lung

(Other definitions for iron lung that I've seen before include "'Type of metal respirator (4,4)'" , "Rigid case fitting over body for artificial respiration" , "breather" , "Artificial respirator" , "Cylinder used in treating polio" .)

I've seen this clue in The Independent.

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